I think i know what you need, a lot of movies i encoded came out with no sound. What you need to do (i think) is open up the film with virtualdub then click on the audio drop down menu and select full processing mode, then again in audio menu select conversion and make sure on the sampling rate you select 44100Hz then save as Wav. It may say you dont have an audio decompressor, you can get one here if thats the case

http://www.dvdrhelp.com/tools.php#Virtualdubtools

Let me know if it works